Module:Sandbox/机智的小鱼君/uuidv4
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--[[
The MIT License (MIT)
Copyright (c) 2012 Toby Jennings
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
associated documentation files (the "Software"), to deal in the Software without restriction,
including without limitation the rights to use, copy, modify, merge, publish, distribute,
sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial
portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT
NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
--]]
local p = {}
-----
math.randomseed(os.time())
math.random()
-----
local function num2bs(num)
local _mod = math.fmod or math.mod
local _floor = math.floor
--
local result = ''
if (num == 0) then
return '0'
end
while (num > 0) do
result = _mod(num, 2) .. result
num = _floor(num * 0.5)
end
return result
end
--
local function bs2num(num)
local _sub = string.sub
local index, result = 0, 0
if (num == '0') then
return 0
end
for i = #num, 1, -1 do
local this_val = _sub(num, i, i)
if this_val == '1' then
result = result + (2 ^ index)
end
index = index + 1
end
return result
end
--
local function padbits(num, bits)
if #num == bits then
return num
end
if #num > bits then
print('too many bits')
end
local pad = bits - #num
for i = 1, pad do
num = '0' .. num
end
return num
end
--
function p.uuid_v4()
local _rnd = math.random
local _fmt = string.format
--
_rnd()
--
local time_low_a = _rnd(0, 65535)
local time_low_b = _rnd(0, 65535)
--
local time_mid = _rnd(0, 65535)
--
local time_hi = _rnd(0, 4095)
time_hi = padbits(num2bs(time_hi), 12)
local time_hi_and_version = bs2num('0100' .. time_hi)
--
local clock_seq_hi_res = _rnd(0, 63)
clock_seq_hi_res = padbits(num2bs(clock_seq_hi_res), 6)
clock_seq_hi_res = '10' .. clock_seq_hi_res
--
local clock_seq_low = _rnd(0, 255)
clock_seq_low = padbits(num2bs(clock_seq_low), 8)
--
local clock_seq = bs2num(clock_seq_hi_res .. clock_seq_low)
--
local node = {}
for i = 1, 6 do
node[i] = _rnd(0, 255)
end
--
local guid = ''
guid = guid .. padbits(_fmt('%X', time_low_a), 4)
guid = guid .. padbits(_fmt('%X', time_low_b), 4) .. '-'
guid = guid .. padbits(_fmt('%X', time_mid), 4) .. '-'
guid = guid .. padbits(_fmt('%X', time_hi_and_version), 4) .. '-'
guid = guid .. padbits(_fmt('%X', clock_seq), 4) .. '-'
--
for i = 1, 6 do
guid = guid .. padbits(_fmt('%X', node[i]), 2)
end
--
return guid
end
--
function p.fake_uuid()
local seed = {'e', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'}
local tb = {}
for i = 1, 32 do
table.insert(tb, seed[math.random(1, 16)])
end
local sid = table.concat(tb)
return string.format(
'%s-%s-%s-%s-%s',
string.sub(sid, 1, 8),
string.sub(sid, 9, 12),
string.sub(sid, 13, 16),
string.sub(sid, 17, 20),
string.sub(sid, 21, 32)
)
end
--
return p